Is my itchy face an allergy to retinol or is it a normal reaction?

I used a retinol and got a very itchy rash on my face. It felt like the rash I get when I use chemical sunscreen , which I am allergic to. But I am reading all about how rare it is to be allergic to retinol and how common it is to have red bumpy skin when you start using it. Is this probably just a normal reaction that will go away or does the itchy quality make it seem like an allergy?